Method and special device for hatching and preferring sepiella maindroni oosperms

Abstract

The invention discloses a special device for hatching and preferring sepiella maindroni oosperms. The device comprises a hatching cage framework with a foaming floater, wherein a nylon mesh sheet which encloses to form a mesh box shape is hung on the hatching cage framework; a plastic retracting rope is arranged close to the bottom of the nylon mesh sheet; a round plastic disc is connected with the inner side of the retracting rope; and small holes are uniformly distributed in the round plastic disc. The special device is simple in structure, convenient to manufacture, low in cost and is strong in production operability, and is easily popularized and applied in an artificial seedling production unit of sepiella maindroni. Hatched young bodies can be preferred within a relatively short time, and the young bodies with regular specification, high activity, no injury and high quality can be obtained. Compared with the young bodies hatched by the other devices, the young bodies hatched by the special device have the advantage that the sickness rate is reduced by 30 percent.

Description

technical field [0001] The invention relates to a fish egg hatching device and method, in particular to a hatching selection method and a special device for fertilized squid eggs. Background technique [0002] Sepiella maindroni de Rochebrune, commonly known as cuttlefish and order fish, belongs to the phylum Mollusca, the class Cephalopoda, the order Decapoda, the family Sepiidae, and the genus Squid ( Sepiella), which is widely distributed along the coast of my country, was once one of the four traditional sea-caught aquatic products in China and has high economic value. In recent years, Chinese scholars have gradually carried out the research work on broodstock fishing, domestication and breeding of squid mansoni, and artificial seed breeding technology, and have basically solved the problem of industrial artificial seedling breeding, but in artificial seedling production, there are still fertilization problems. The phenomenon that the egg hatching rate is low, the hatchi...

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Problems solved by technology

Due to the simple structure adopted, convenient manufacture, low cost and strong production operability, it is easy to be popularized and used in the artificial breeding production units of the needleless cuttlefish; it is easy to clean the fertilized eggs in the hatching cage and disinfect the cage; the fertilized eggs can be scattered and distributed On the plastic disc, the problems of excessive density of fertilized eggs, easy hypoxia of fertilized eggs, and obstruction of embryo respiration are solved, and the hatching rate of squid eggs is effectively improved; the burr edge of the small hole can promote the rupture of squid larvae. Improve the hatching survival rate. Using this hatching device, the hatching rate can reach 25.0%~33.8%, which is much higher than other hatching methods of 12.1~18.5%. Compared with other hatching methods, using this hatching device can increase the hatching rate by 26.3~ 35.2%; hatched larvae can be optimized in a relatively short period of time, and larvae with neat specifications, strong vitality, no damage, and high quality can be obtained

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